反应详情

A solution of (3-(3-(2,6-dimethoxyphenyl)-1-((2-(trimethylsilyl)ethoxy)methyl)-1H-pyrazolo[3,4-b]pyridin-5-yl)phenyl)(4-(2-(dimethylamino)ethyl)piperazin-1-yl)methanone in 5% of perchloric acid in acetic acid (1 mL) was stirred for 45 minutes at room temperature. Sodium hydroxide solution (2M) was then added to the solution slowly until pH ˜8. Ethyl acetate was then used for extraction and the organic layers were combined and concentrated to dryness, which was then redissolved in methanol (1 mL) and sodium carbonate (2M, 1 mL). The mixture was stirred at room temperature for 15 hours before being diluted with water and extracted with ethyl acetate (3×). The organic layers were combined, dried over sodium sulfate, filtered and concentrated to dryness. Mass triggered reverse phase HPLC purification afforded (3-(3-(2,6-dimethoxyphenyl)-1H-pyrazolo[3,4-b]pyridin-5-yl)phenyl)(4-(2-(dimethylamino)ethyl)piperazin-1-yl)methanone (22.70 mg, 56% yield for two steps) as white solids. 1H NMR (500 MHz, CD3OD) δ 2.48 (br, 2H), 2.52 (s, 6H), 2.60 (m, 4H), 2.69 (m, 2H), 3.51 (br, 2H), 3.74 (s, 6H), 3.80 (br, 2H), 6.80 (d, J=8.5 Hz, 2H), 7.43 (m, 2H), 7.56 (t, J=8.0 Hz, 1H), 7.69 (s, 1H), 7.75 (d, J=8.0 Hz, 1H), 8.09 (d, J=2 Hz, 1H), 8.81 (d, J=2 Hz, 1H). MS: m/z 515.2 (M+H+).

1. extractionEthyl acetate was then used for extraction
2. concentrationconcentrated to dryness, which
3. dissolutionwas then redissolved in methanol (1 mL)
4. additionbefore being diluted with water
5. extractionextracted with ethyl acetate (3×)
6. dry with materialdried over sodium sulfate
7. filtrationfiltered
8. concentrationconcentrated to dryness
9. customphase HPLC purification